In this paper, an SEIV epidemic model with vaccination and nonlinear incidence rate is formulated. The analysis of the model is presented in terms of the basic reproduction number R0. It is shown that the model has multiple equilibria and using the center manifold theory, the model exhibits the phenomenon of backward bifurcation where a stable diseasefree equilibrium coexists with a stable ende...

In this work, we study an epidemic model with vaccination and vertical transmission. We get the basic reproduction number R0 of the system and carry out a bifurcation analysis and obtain the conditions ensuring that the system exhibits backward bifurcation. Mathematics Subject Classification : 34C05, 92D25

Brucellosis is one of the severe public health problems; the cumulative number of new human brucellosis cases reached 211515 from 2010 to 2014 in China. Bayingolin Mongol Autonomous Prefecture is situated in the southeast of Xinjiang, where brucellosis infection occurs every year. Based on the reported data of newly acute human brucellosis cases for each season in Bayingolin Mongol Autonomous P...

Selenium (Se) is an essential micro-nutrient for living organisms, but elevated concentrations in water can adversely affect health. In this research, we investigate the removal of selenium oxyanions (selenate and selenite) aqueous systems by integration adsorption on modified zeolites microbial reduction. Dynamic sorption-reduction experiments were conducted using two sets zeolite columns sele...

Selenium (Se) is essential for the basic functions of life, but low daily intake Se urges us to find reliable ways increase food content. Plant-growth-promoting bacteria (PGPB) have shown potential in enhancing plant growth and accumulation. In this study, soils collected from a tailing were used isolate Se-tolerant PGPB. The results showed that total three strains identified. Strain LWS1, belo...

Selenium (Se)-enriched vegetables are promising dietary sources of Se, which provides beneficial biological effects in humans. In this study, we investigated the foliar application Se on hydroponically grown multi-leaf green (V1) and red (V2) lettuce plants. Three selenate (SeIV) amendment levels were evaluated for their influence plant growth, elemental composition radical scavenging capacity....

The bioconversion of selenium in the form sodium selenite (Na2 SeO3 ) (SeIV) or selenate SeO4 (SeVI) to organic by Lactobacillus casei (L. casei) was investigated vitro. MRS media supplemented with 1, 2, 5, 10 20 ppm Se, inoculated 2% starter culture about 105 cfu/ ml L. and then incubated up 24 hrs at 37o C. Increasing “Se(IV)” concentrations markedly reduced bacterial growth compared “Se(VI)”...